DEUTERIUM PUMPING WITH SUPERPERMEABLE MEMBRANE IN THE DIVERTOR OF JFT-2M TOKAMAK

摘要

There has been big progress in the last decade towards the demonstration of high performance plasmas in nuclear fusion research. This progress has often been coupled to improved wall materials and better conditioning techniques for impurity control and lower recycling. Wall coating techniques such as carbonization, boronization and beryllium evaporation not only reduce oxygen contamination and metal influx from the wall but also provide reduced hydrogen/deuterium recycling around the wall [ 1 ], which is responsible to prevent a confinement degradation. Due to finite wall capacities, however, these techniques are limited to transient pumping and may not be effective for long pulse operation in superconducting machines such as Tore Supra, LHD and ITER. The future direction towards long-pulse or steady-state experiments requires the development of a new type of divertor pumping system.